feat: migrate frontend from Vue 3 to React 18 with TanStack ecosystem

- Complete rewrite of frontend using React 18 + TypeScript in strict mode
- Implement TanStack Router for file-based routing matching URL structure
- Use TanStack Query for server state management with smart caching
- Replace Pinia stores with React Context API for auth and UI state
- Adopt Tailwind CSS + shadcn/ui components for consistent styling
- Switch from pnpm to Bun for faster package management and builds
- Configure Vite to support React, TypeScript, and modern tooling
- Create frontend.go with Go embed package for embedding dist/ in binary
- Implement comprehensive TypeScript interfaces (strict mode, no 'any' types)
- Add dark mode support throughout with Tailwind CSS dark: classes
- Set up i18n infrastructure (English translations included)
- Remove all Vue 3 code, components, stores, CSS, and assets
- Includes 18 new files with ~2000 lines of production-ready code

frontend/src/api/index.ts

@@ -1,9 +1,14 @@
-import * as files from "./files";
-import * as share from "./share";
-import * as users from "./users";
-import * as settings from "./settings";
-import * as pub from "./pub";
-import search from "./search";
-import commands from "./commands";
+/**
+ * API namespace exports
+ * Re-export all API functions grouped by domain
+ */
 
-export { files, share, users, settings, pub, commands, search };
+export * as auth from "./auth";
+export * as files from "./files";
+export * as settings from "./settings";
+export * as users from "./users";
+export * from "./preview";
+export * from "./search";
+export * from "./share";
+export * from "./client";
+export * from "./queryKeys";